--- a/grpc_testing/stub_server.go
+++ b/grpc_testing/stub_server.go
@@ -86,5 +86,5 @@ func (d dummyStubServer) UnaryCall(context.Context, *testpb.SimpleRequest) (*tes
 // NewDummyStubServer creates a simple test server that serves Unary calls with
 // responses with the given payload.
 func NewDummyStubServer(body []byte) *StubServer {
-	return New(dummyStubServer{body: body})
+	return New(&dummyStubServer{body: body})
 }